Предмет: Математика, автор: mariamsarkisyan2007

Заранее спасибо. Помогите номер 91 б)

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Ответы

Автор ответа: nadyassergienko
0

Скорость катера по течению -36 км.ч. скорость реки составляет 1/6 скорости катера по течению, так как 12:(12-10)= 6.

То есть скорость по течению равна V катера 5 частей и V реки 1 часть , вместе 6.

А скорость против течения V катера 5 частей-V реки 1 часть= 4 части. 24:4 = 6 км.ч. скорость реки . 6·6= 36 км.ч.

Интересные вопросы
Предмет: Английский язык, автор: dinarkarimov
1. Choose the correct item.
1) Indian elephants are very big and ....
a) tall b) cute C) wild
2) A snake is an animal with long ... and no legs.
a) neck b) body c) trunk
3) The peacock has got long beautiful....
a) legs b) fur c) feathers
4) … can stay without water for a long time.
a) lions b) camels c) rhinos
5) Lions don’t eat....
a) people b) meat c) grass
6) They have got two pets. They’re a parrot and ....
a) a guinea pig b) a goose c) a koala
7) What does your pet... ? — He likes meat and fish.
a) look like b) eat c) food
8) Му budgie has got a little yellow ....
a) mane b) beak
9) Indian people use ... to carry heavy things.
a) tigers b) rhinos
10) Monkeys like eating ... .
a) grass b) fruit
11) There are cows, sheep and ... on his farm.
a) a goat b) a tortoise
12) What’s ... with your pet?
a) colour b) wrong
13) What does your cat look like? — It’s ...
a) three years old b) noisy c) black and furry
c) paws
с)elephants
c) small animalse
c) a deer
c) doing


2. Put the verbs in brackets into the correct form.
1. The Indian rhino usually ... (live) alone.
2. A giraffe ... (have) a long neck and long legs.
3. His budgie ... (sing) all day long.
4. Does anyone else ... (like) dogs?
5. They never... (drink) water.
6. Many amazing animals ... (live) there.
7. My cat... (play) in the garden all day long.
8. I... (take) him for walks in the park every day.
9. Where do they ... (go) every week?
10. Their thick fur ... (keep) them warm.

3. Fill in the gaps with do, does, don't or doesn’t.
1) … you have lions in your country? — No, we ....
2) … the deer eat grass? — Yes, it....
3) … your pet have any problem? — No, he ... .
4) … vets help animals stay healthy? — Yes, they ....
5) … you like monkeys? — No, I....
6) … koalas sleep during the day? — Yes, they....
7) … she read this magazine about birds? — No, she ...
8) … your pet eat insects? — Yes, he ....